Toy using water reactive paper

Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface

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434 81, 434 84, 434 85, 434 87, B43L 100, G09B 1100, G09B 1110

Patent

active

051638460

ABSTRACT:
A toy has a frame with a display area for receiving a water reactive paper. The paper has a brightly colored substrate covered by a surface layer of silica and resin which becomes transparent when wet and opaque when dry so that the bright color does or does not show through depending upon whether the surface is wet or dry. Thus, the paper appears to have disappearing ink.

REFERENCES:
patent: 3581882 (1971-06-01), Bish
patent: 3838520 (1974-10-01), Quenot
patent: 4139965 (1979-02-01), Curry et al.
patent: 4604062 (1986-08-01), Woods
patent: 4836381 (1989-07-01), Edwards et al.
patent: 4836783 (1989-06-01), Harper

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